How do i add an image slider?

I have recently created a blog, and selected oxygen as my theme. I have not been able to set up an image slider as the "header" to my main page. When this theme was previewed it shows 6 images sliding at the top as the header. I have tried different tutorials with no result. Kindly Help.

Secondly is there any way to remove the "blogroll" from my main page? It is a list of links i do not need.
Thank you for your time and support.

Showcase page template
When you first activate Oxygen, you’ll see your posts in a traditional blog format but if you’d like to showcase your content in an online magazine-like fashion, then you can use the Showcase Page template. ...

Post thumbnails are 470 pixels wide, unless you make the post Sticky to show off in the featured slider, in which case they’re 750 pixels wide. Keep in mind: if you mark a post as Sticky but the featured image is less than 750 pixels wide, then it won’t display in the slider and will still disappear from the river of posts.

If you failed to upload and set a featured image in each post and until you do upload one into each one the gray box will be there.

Secondly is there any way to remove the "blogroll" from my main page? It is a list of links i do not need.

Every theme has a default display of what appears to be widgets. When you go here and select and activate widgets of your own choice the default display disappears. Click each widget to opp[en, configure where required, click "save" and click "close".